"Is he married?"—"Not that I know of."

“他结婚了吗？”—“据我所知没有。”

《柯林斯英汉双解大词典》

You are kidding, not that I know of.

您开玩笑，没那回事儿。

youdao

Not that I know of.

据我所知不是那样的。

youdao

Montclin did not move. "You know as well as I do that it is no use to tell Athnaise anything,"

VOA: special.2009.06.27

So not that I know what the classics are, but I know when I see it.

我并不是很懂古典艺术，但看到的时候我能分辨出来。

喜欢毕加索吗？ - SpeakingMax英语口语达人

The problem is, I want to know if, in fact, I've got something that's not of the form I expect.

问题是,我希望知道如果输入的。

麻省理工公开课 - 计算机科学及编程导论课程节选

This isn't proven yet, at least not that I know of.

NPR: What Does Watada Case Mean for Military Law?

"Not that I know of, " he answered.

CNN: AEG exec: I didn't know Michael Jackson abused drugs

"I was aware that there was some attention on my work but I did not know that there was international attention looking at what I was doing, " he told BBC News.

BBC: Italy waste campaigner wins 2013 Goldman Prize